SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 



445 



•■> '^ 34 '/m 



Figs. 31 and 32 Opossum, two transverse sections through the hippocampal 

 formation to show the relations of the primordium. Cell preparation. Descrip- 

 tion in text. 



Fig. 33 Opossum, part of a parasagittal section cutting the rostral limb of 

 the anterior pallial conimissure. Its position is indicated by the line h in figure 29. 



Fig. 34 Similar figure to the last, from another specimen. Section nearer 

 the median plane (line a, fig. 29). Both figures show that the commissure fibers 

 as they pierce the wall to reach the alveus are arranged in larger and smaller 

 bundles and that between these a considerable amount of space is filled with 

 cells which establish continuity between the primordium hippocampi and the 

 polymorphic layer of the hippocampus. Magn. 60 diam. 



